title: Methyl 5''-chloro-1',1''-dimethyl-2,2''-dioxodi-spiro-[indoline-3,2'-pyrrolidine-3',3''-indoline]-4'-carboxyl-ate.
abstract: In the title compound, C22H20ClN3O4, the central pyrrolidine ring adopts an envelope conformation on the N atom. The indolinone systems are individually roughly planar, with maximum deviations from their mean planes of 0.130 Å for the spiro C atom of the indolinone unit and 0.172 Å for the carbonyl C atom of the 5-chloro-1-methyl-indolinone unit. They make dihedral angles of 77.7 (8) and 86.1 (8)° with the mean plane through the central pyrrolidine ring. In the crystal, mol-ecules are linked by N-H⋯O hydrogen bonds supported by C-H⋯O contacts into chains along the ab diagonal. The structure also features C-H⋯O hydrogen bonds, forming R 2 (2)(8) and R 2 (2)(16) rings and generating a three-dimensional array.
authors.affiliation: Department of Physics, S.M.K. Fomra Institute of Technology, Thaiyur, Chennai 603 103, India.
authors.forename: Piskala Subburaman
authors.initials: PS
authors.lastname: Kannan
authors.forename: Panneerselvam
authors.initials: P
authors.lastname: Yuvaraj
authors.forename: Karthikeyan
authors.initials: K
authors.lastname: Manivannan
authors.forename: Boreddy Siva Rami
authors.initials: BS
authors.lastname: Reddy
authors.forename: Arunachalathevar
authors.initials: A
authors.lastname: Subbiahpandi